Term 721
Recursive lookup
A recursive lookup is a query process where a DNS resolver asks multiple DNS servers one after another until it finds the IP address for a domain name, rather than relying on pre-stored information.
Acronym study
Terms 721–750 of 1033 N10-009 acronyms and key terms. Each entry includes a plain-English definition and a link to the full 800-word glossary page with exam context and practice questions.
Term 721
A recursive lookup is a query process where a DNS resolver asks multiple DNS servers one after another until it finds the IP address for a domain name, rather than relying on pre-stored information.
Term 722
Red-Green-Blue (RGB) is a color model that combines red, green, and blue light to create a wide range of colors, primarily used in digital displays and imaging systems.
Term 723
Redundancy is the practice of adding extra components or systems so that if one fails, another can take over without interruption.
Term 724
A technology that combines multiple physical hard drives into a single logical unit to improve performance, reliability, or both.
Term 725
A region is a distinct geographic location where a cloud provider operates multiple data centers that are connected by low-latency networks and provide cloud services.
Term 726
A region pair is two Azure regions within the same geography that are at least 300 miles apart and are used together to provide data residency, compliance, and high availability through paired recovery and updates.
Term 727
A regional load balancer distributes incoming network traffic across resources located in multiple geographic regions to ensure high availability, low latency, and fault tolerance at a global scale.
Term 728
A modular connector standard used for Ethernet cabling, commonly known as the 8P8C connector with a specific wiring pattern for structured network wiring.
Term 729
An RJ45 connector is the clear plastic plug at the end of an Ethernet cable that connects computers, routers, and switches to form a wired network.
Term 730
Reliability is the measure of a system's ability to consistently perform its intended functions without failure over a specified period of time under stated conditions.
Term 731
The Reliability pillar is a set of best practices in cloud architecture that ensures a system can recover from failures, scale to meet demand, and deliver consistent performance over time.
Term 732
Remote Desktop Protocol is a technology that lets you connect to and control another computer from a different location, as if you were sitting in front of it.
Term 733
Remote Monitoring and Management (RMM) is a technology that allows IT professionals to monitor, manage, and maintain computer systems and networks from a distant location without being physically present.
Term 734
Resilient File System (ReFS) is a Microsoft file system designed to maximize data availability, resist corruption, and handle large volumes of data efficiently.
Term 735
Resource hierarchy is the structured, parent-child ordering of cloud resources that governs access control, policy inheritance, and resource organization across a cloud platform.
Term 736
Resource pooling is a cloud computing model where a provider's computing resources are shared across multiple tenants, with resources dynamically assigned and reassigned based on demand.
Term 737
Restrict mode is a port security violation action on a managed switch that allows the port to stay active and forward traffic for authorized devices, but discards traffic from unauthorized devices while logging the violation.
Term 738
Revolutions Per Minute (RPM) measures how many full rotations a spinning component, such as a hard drive platter or a cooling fan, completes in one minute.
Term 739
RFID uses radio waves to wirelessly identify and track tags attached to objects, enabling automatic data capture without line-of-sight.
Term 740
RIP (Routing Information Protocol) is a distance-vector routing protocol that routers use to exchange information about network paths to determine the best route for data packets based on hop count.
Term 741
RISC is a CPU design philosophy that uses a small, highly optimized set of instructions to execute operations quickly and efficiently.
Term 742
RJ45 is a standardized physical connector used to plug Ethernet cables into computers, routers, switches, and other networking devices.
Term 743
A rogue access point is an unauthorized wireless access point installed on a network without the network administrator's knowledge or permission, creating a serious security vulnerability.
Term 744
A Rogue Access Point is an unauthorized wireless access point connected to a network without the network administrator's permission, creating a serious security vulnerability.
Term 745
ROM (Read-Only Memory) is a type of computer memory that permanently stores important instructions needed to start up and run hardware, and its contents cannot be easily changed or erased.
Term 746
The root bridge is the central reference point in a Spanning Tree Protocol (STP) network, serving as the logical root of the spanning tree topology.
Term 747
Root Guard is a Spanning Tree Protocol (STP) feature that protects the root bridge placement on a network port to prevent unauthorized switches from becoming the root bridge.
Term 748
A root port is the port on a non-root switch in a Spanning Tree Protocol network that has the lowest cost path to the root bridge.
Term 749
A route is a path that data takes through a network from one device or network to another, determined by routing protocols and configured rules.
Term 750
Route 53 is Amazon Web Services’ cloud-based Domain Name System (DNS) web service that translates human-readable domain names into IP addresses and routes end-user requests to internet applications.